Evidence of weak superconductivity at the room-temperature grown LaAlO3/SrTiO3 interface

Guenevere E D K Prawiroatmodjo; F. Trier; D.V. Christensen; Y. Chen; N Pryds; Thomas Sand Jespersen

doi:10.1103/physrevb.93.184504

Evidence of weak superconductivity at the room-temperature grown LaAlO₃/SrTiO₃interface

Guenevere E D K Prawiroatmodjo, F. Trier, D.V. Christensen, Y. Chen, N Pryds, Thomas Sand Jespersen

Condensed Matter Physics

28 Citations (Scopus)

Abstract

The two-dimensional electron gas at the crystalline LaAlO3/SrTiO3 (c-LAO/STO) interface has sparked large interest due to its exotic properties, including an intriguing gate-tunable superconducting phase. While there is growing evidence of pronounced spatial inhomogeneity in the conductivity at STO-based interfaces, the consequences for superconductivity remain largely unknown. We study interfaces based on amorphous LAO top layers grown at room temperature (a-LAO/STO) and demonstrate a superconducting phase similar to c-LAO/STO, however, with a gate-tunable critical temperature of 460mK. The dependence of the superconducting critical current on temperature, magnetic field, and back-gate-controlled doping is found to be consistently described by a model of a random array of Josephson-coupled superconducting domains.

Original language	English
Article number	184504
Journal	Physical Review B
Volume	93
Issue number	18
ISSN	2469-9950
DOIs	https://doi.org/10.1103/physrevb.93.184504
Publication status	Published - 16 May 2016

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title = "Evidence of weak superconductivity at the room-temperature grown LaAlO3/SrTiO3 interface",

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AU - Prawiroatmodjo, Guenevere E D K

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AU - Chen, Y.

AU - Pryds, N

AU - Jespersen, Thomas Sand

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Evidence of weak superconductivity at the room-temperature grown LaAlO3/SrTiO3 interface

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Evidence of weak superconductivity at the room-temperature grown LaAlO₃/SrTiO₃interface